The phenomenon of even bulk modes variance in a ferromagnetic A--A bilayer system
Zhou Wen-Ping(周文平)a) † ,Yun Guo-Hong(云国宏)a)b), and Liang Xi-Xia(梁希侠) a)
a Laboratory of Solid State Physics, Department of Physics, Inner Mongolia University, Hohhot 010021, China; b Department of Physics, Inner Mongolia Normal University, Hohhot 010021, China
Abstract The eigenproblems of spin waves in a symmetrical ferromagnetic bilayered system with periodic boundary conditions are solved using the interface-rescaling approach (IRA). The results show that interface coupling between two sublayers would not change the excitation energy of odd bulk modes, but change excitation energy of even bulk modes. We call this peculiar phenomenon the phenomenon of even bulk mode variance (PEBMV). There are two kinds of mechanisms which cause PEBMV: phase reversal and phase translation of the magnon at the interface, corresponding, respectively, to the antiferromagnetic and ferromagnetic interface coupling cases. PEBMV embodies the selective effect of the interface on different bulk magnons.
Received: 17 April 2009
Revised: 11 September 2009
Accepted manuscript online:
PACS:
75.70.Cn
(Magnetic properties of interfaces (multilayers, superlattices, heterostructures))
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the Foundation
for Key Program of Ministry of Education, China (Grant No 206024),
National Natural Science Foundation of China (Grant No 10762001),
Program for New Century Excellent Talents in University of China (Grant No
NCET-05-027
Cite this article:
Zhou Wen-Ping(周文平),Yun Guo-Hong(云国宏), and Liang Xi-Xia(梁希侠) The phenomenon of even bulk modes variance in a ferromagnetic A--A bilayer system 2009 Chin. Phys. B 18 5496
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